Epsilon Doradus
Star in the constellation Dorado
From Wikipedia, the free encyclopedia
Epsilon Doradus, Latinized from ε Doradus, is a solitary[9] star located in the southern constellation of Dorado. It is visible to the naked eye with an apparent visual magnitude of 5.11.[2] Based upon an annual parallax shift of 5.68 mas as measured from Earth, it is located roughly 570 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.09 due to interstellar dust.[6]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Dorado |
| Right ascension | 05h 49m 53.52107s[1] |
| Declination | −66° 54′ 04.2787″[1] |
| Apparent magnitude (V) | 5.11[2] |
| Characteristics | |
| Spectral type | B6 V[3] |
| U−B color index | −0.49[2] |
| B−V color index | −0.14[2] |
| Variable type | SPB[4] |
| Astrometry | |
| Radial velocity (Rv) | +15.5±1.6[5] km/s |
| Proper motion (μ) | RA: −21.81[1] mas/yr Dec.: +37.55[1] mas/yr |
| Parallax (π) | 5.68±0.15 mas[1] |
| Distance | 570 ± 20 ly (176 ± 5 pc) |
| Absolute magnitude (MV) | −0.20[6] |
| Details | |
| Mass | 4.31±0.05[7] M☉ |
| Radius | 3.8±0.6[4] R☉ |
| Luminosity | 556[7] L☉ |
| Surface gravity (log g) | 3.89±0.20[4] cgs |
| Temperature | 13,212[7] K |
| Rotational velocity (v sin i) | 17[7] km/s |
| Age | 210[6] Myr |
| Other designations | |
| ε Dor, CD−66°351, HD 39844, HIP 27534, HR 2064, SAO 249368, 2MASS J05495356-6654041, Gaia DR2 4659664312127365632[8] | |
| Database references | |
| SIMBAD | data |
This is a B-type main sequence star with a stellar classification of B6 V.[3] It is a slowly pulsating B-type star with a mean longitudinal magnetic field strength of −64±26 G.[4] With 4.31[7] times the mass of the Sun and 3.8[4] times the Sun's radius, it is about 85% of the way through its main sequence lifetime.[7] The star is an estimated 210[6] million years old and is spinning with a projected rotational velocity of 17 km/s.[7] Epsilon Doradus radiates 556 times the solar luminosity from its photosphere at an effective temperature of 13,212 K.[7]